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3 years ago

The conjugate pair for a strong base is -

Chemistry

1 answer:

xxTIMURxx [149]3 years ago

4 0

Weak acid is the answers

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Two star systems are part of a ________________ system formation.

Radda [10]

Binary Stars I think

hope this is right and helps

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2 years ago

What is the answer to this question

Stels [109]

Answer:

38 kg/m³

0.038 g/mL

Explanation:

Volume of a cube is the side length cubed.

V = s³

Given s = 0.65 m:

V = (0.65 m)³

V ≈ 0.275 m³

The mass is 10.5 kg. The density is the mass divided by volume:

ρ = (10.5 kg) / (0.275 m³)

ρ ≈ 38 kg/m³

Or:

ρ ≈ 0.038 g/mL

4 0

3 years ago

The ksp of yttrium fluoride, yf3, is 8.62 × 10-21. calculate the molar solubility of this compound.

motikmotik

Answer:

The molar solubility of YF₃ is 4.23 × 10⁻⁶ M.

Explanation:

In order to calculate the molar solubility of YF₃ we will use an ICE chart. We identify 3 stages: Initial, Change and Equilibrium and we complete each row with the concentration of change of concentration. Let's consider the solubilization of YF₃.

YF₃(s) ⇄ Y³⁺(aq) + 3 F⁻(aq)

I 0 0

C +S +3S

E S 3S

The solubility product (Ksp) is:

Ksp = [Y³⁺].[F⁻]³= S . (3S)³ = 27 S⁴

$S=\sqrt[4]{Ksp/27} =\sqrt[4]{8.62 \times 10^{-21} /27}=4.23 \times 10^{-6}M$

6 0

3 years ago

How many moles of Boron are present in 20g of borax (sodium tetraborate)?

stira [4]

20 grams of borax contains (20.0g) / (201 g mol -1) =0.10 mol of borax.

Therefore 0.40 mol of borax

5 0

3 years ago

Write the chemical equation that represents the process of lattice energy for the case of nacl.

faust18 [17]

Answer: $Na^+(g)+Cl^-(g)\rightarrow NaCl(s),\Delta H_{Lattice}=-786kJ/mol$

Explanation:

Lattice energy : It is defined energy released when ions combine together in a gaseous phase to form a compound. it is energy possessed by the crystal lattice of a compound. Denoted by symbol $\Delta H_{Lattice}$ .

$\Delta H_{Lattice}=positive$ , energy is absorbed while forming of the lattice

$\Delta H_{Lattice}=negative$ , energy is release while forming of the lattice

$Na^+(g)+Cl^-(g)\rightarrow NaCl(s),\Delta H_{Lattice}=-786kJ/mol$

One mole of sodium ion when combines with one mole chloride ion release 786 kJ of energy.

4 0

3 years ago

Read 2 more answers